<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/velocity/1.2.3/velocity.min.js"></script>
  </head>
  
  <body>
    <!-- 利用js和第三方js动画插件 实现组件动画 -->
    <div id="app">
      <button @click="show=!show">按钮</button>
      <transition @before-enter="beforeEnter" @enter="enter" @leave="leave" :css="false">
        <p v-if="show">hello vue</p>
      </transition>
    </div>
    <script>
      var app = new Vue({
        el: '#app',
        data: {
          show: false
        },
        methods: {
          beforeEnter: function (el) {
            el.style.transformOrigin = 'left'
          },
          enter: function (el, done) {
            Velocity(el, { opacity: 1, fontSize: '1.4em' }, { duration: 300 })
            Velocity(el, { fontSize: '1em' }, { complete: done })
          },
          leave: function (el, done) {
            Velocity(el, {
              translateX: '80px',
              rotateZ: '50deg'
            }, { duration: 600 })
            Velocity(el, {
              translateY: '80px',
              translateX: '150px',
              opacity: 0
            }, { complete: done })
          }
        }
      })
    </script>
  </body>
</html>